Question

5. in mendel's experiments with Garden pea round seed shape(RR) was dominant over wrinkled seeds (rr), yellow cotyledon(YY) was dominant over green cotyledon(yy). what are the expected phenotypes in the the F2 generation of the cross capital RRYYx rryy?

a) only round seeds with green cotyledons .
b) only wrinkled seeds with yellow cotyledons
c) only wrinkled seeds with green cotyledons
d) round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons ​

Answer 1

Explanation:

In Mendel’s dihybrid cross, cross is made between homozygous yellow round seeds(YYRR) to another homozygous green wrinkled seeds(yyrr). In the F1 generation, all plants are heterozygous yellow round(YyrRr). When this plant is subjected to self pollination, in the F2 generation, 9 plants are Yellow round, 3 plants are yellow wrinkled, 3 plants are green round and 1 plant is green wrinkled are formed.

So, the correct option is ‘Round seeds with yellow cotyledons and wrinkled seeds with green cotyledons’.

Answer 2

Answer:

d) round seeds with yellow cotyledons and wrinkled seed with yellow cotyledons

explanation:

options a,b,c are out valid bcz in F2 generation plant doesn't produce with only single phenotype.

phenotype ratio of F2 generation is:

round yellow-9

round green-3

wrinkled yellow-3

wrinkled green-1